My Dell 7820 only runs 4 sticks of 3200 ram 32g clocked as 2933. If I put ram 5 and/or 6 in it, it won't bios. I get "Bios repairing flash", then a constant "no ram flash." Bios v. 2.39

It's supposed to run 6 sticks of 3200 clocked at 2933 by the CPU.

No matter which of the 6 sticks of ram I use by swapping them out and around, it'll run only 4 sticks, max.

I haven't pulled the jumper to reset bios, but I have used the bios reset inside of the bios utility to set it back to factory settings and also to set it to the latest bios setting, all to no avail.

I'm stumped I do not have the same brand of ram in all slots, but they all will work independently in any order as long as I only use 4 sticks.

Any ideals would be appreciated.

Thanks,

David